Greaseproof gummed paper



Patented Aug. 9.

, onnasnrnoor comma rarnn.

Ferdinand W. Humphner, Oak Park, Ill., as-

signor, by mesne Gummed Paper Delaware assignments, to Mid-StatesCompany; acorptiratioh of No Drawing. Application September 30, 1935,

Serial No. 42,913 r '5 Claims. (01. 91-68) This invention relates togreaseproof gummed .D per and is particularly useful in connection withgummed paper which is used for labels that are to be attached to oily oroil-secreting surfaces such as the dressed skin of poultry, etc.

An object of the invention is to provide.

gummed paper which may be readily applied to oily or oil-secretingsurfaces without producing a discoloration or deforming of the paper orm label. 1

Other specific objects and advantages will appear as the specificationproceeds.

In preparing my improved greaseproof gummed paper, I employ any suitablepaper for gumming such as the paper which is ordinarily used for thispurpose andfor forming gummed labels,- etc. One side ofthe paper iscoated with a thin layer of lacquer, the lacquer being resistant to oil.The lacquer may be ,of any suitable composition.

2i) I have found that a large variety of lacquersare satisfactory inthat they prevent oil frompassing into the paper. Lacquers formed ofvinyl resins and other synthetic resins have been foundverysatisfactory. .Also, I-am able to em- 25 ploy lacquers in various formsbeginning with the synthetic type and including those containingnitrocellulose and to which are added resins of various types.

Adhesive containing a reactive solvent is next 30 applied to'the lacquersurface and preferably as soon as possible after the lacquer has dried.The ahesive may be of any suitable composition such as water solubleglue, etc. The solvent is employedfor two fundamental purposes. Itsfirst g5 object is to enable the water soluble adhesive to obtain a gripon the lacquer surface which is normally repellentto' the adhesive. Asecond object is to enable the adhesive, after it has been remoistened,to again regain its grip on the 40 lacquer surface. In theinitialforming of the' gummed paper, the adhesive, when -dried', con- Itains a small portion of the solvent which again becomes active uponmoistening of the adhesive and enables the moistened adhesive to regainits 45 hold on the lacquer.

The solvent may be of any suitable {type bu preferably of a watermiscible type: I have found mono-methyl ether of ethylene glycolsatlsfactory for this purpose.

50 As an example of the process, Ihave added from one-half to one percent of the above solvent, mono-methyl ether of ethylene glycol, to awater soluble adhesive and have found that such a compounded adhesivemaintains its hold upon 56 the oilimpervious coatingor lacquer.

The coating or gummed product may be tinted orimprinted in any desiredmanner to give the product a distinctive color or mark foridentification, etc. Also, if desired, the lacquer or oilresistantcoating may be applied to both sides of the paper, if desired, to makethe entire product greaseproof.

After the lacquer and adhesive coatings have i been applied and theproduct is dry I pass the paper over the usual gum-fracturing bartobreak up the gum layer into segments which prevent curling. I find thatthis processing operation resuits in thorough and uniform fracturing ofthe gum layer without breaking the continuous surface of'the lacquer,etc. At the same time, thewater is prevented from entering the paper.

The presence of a solvent in the gum fragments enables the dissolvedadhesive to regain its grip on the lacquer. The lacquer coating remainsunchanged in position to prevent passage of oil into the body of thepaper.

The new product may be readily applied to a surface without weakeningthe paper body and the written orprinted matter on thepaper is notobliterated or made difficult to read by oil discolorations.

The foregoing detailed description has been given for clearness ofunderstanding only, and no unnecessary limitations should be understoodtherefrom, but the appended claims should be construed as broadly aspermissible, in vlew of the prior art I claim: o

'1. A greaseproof gummed paper for labels and the like comprising astrip of paper having at least one side thereof coated with awater-insoluble oil-resistant lacquer, a water soluble adhesive on saidlacquer, said adhesive being fractured throughout to prevent curling,and an organic solvent for said lacquer remaining in said adhesive foruniting said adhesive to said coating.

. 2. A greaseproof gummed paper comprising a strip of paper having atleast one side thereof covered with an oil resistant waterproof lacquer,awater soluble adhesive over said lacquer, an organic solvent forsaidlacquer and said adhesive contained'in said adhesive for uniting saidadhesive to said lacquer, said adhesive being fractured throughout whilesaid lacquer remains unbroken.

' resin lacquer, a water soluble adhesive over said lacquer, arelatively high boiling water-miscible organic solvent for said lacquercontained in said adhesive, said adhesive being fractured throughoutwhile said lacquer remains unbroken.

4. A gummecl paper tape comprising'a strip of paper havingat least oneside thereof coated with a waterproof oil resistant resinous lacquer, anadhesive over said lacquer, said adhesive having contained therein aderivative of a dihydric alcohol for uniting said adhesive to saidlacquer, said derivative being a solvent for said adhesive and saidlacquer, and said adhesive being brolsen into small fragments to renderthe tape noncurling, said lacquer surface being unbroken.

5. A greaseproof gummed paper comprising a strip of paper having atleast one side thereofcovered with an oil-resistant waterproof lacquer,a water-soluble adhesive over said lacquer, said adhesive containingmonomethyl ether of ethylene glycol, said ether being a solvent for, andserving to unite, said adhesive and said lacquer, and said adhesivebeing fractured throughout while said lacquer coating remains unbroken.

FERDINAND W.

